404172352221 has 32 divisors (see below), whose sum is σ = 593635392000. Its totient is φ = 242559766080.

The previous prime is 404172352217. The next prime is 404172352231. The reversal of 404172352221 is 122253271404.

It is a happy number.

It is not a de Polignac number, because 404172352221 - 2² = 404172352217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404172352231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8659455 + ... + 8706003.

It is an arithmetic number, because the mean of its divisors is an integer number (18551106000).

Almost surely, 2^404172352221 is an apocalyptic number.

It is an amenable number.

404172352221 is a deficient number, since it is larger than the sum of its proper divisors (189463039779).

404172352221 is a wasteful number, since it uses less digits than its factorization.

404172352221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49129.

The product of its (nonzero) digits is 26880, while the sum is 33.

The spelling of 404172352221 in words is "four hundred four billion, one hundred seventy-two million, three hundred fifty-two thousand, two hundred twenty-one".